View source for PNO-V-85-057A, on 850912,turbine Trip/Reactor Trip Occurred Due to Fire in Main Turbine Exciter Encl.Fire Caused by Electrical Arcing Between Generator Exciter Bus Bars Due to Carbon Buildup from Exciter Brushes

{{Adams
| number = ML20135G558
| issue date = 09/13/1985
| title = PNO-V-85-057A:on 850912,turbine Trip/Reactor Trip Occurred Due to Fire in Main Turbine Exciter Encl.Fire Caused by Electrical Arcing Between Generator Exciter Bus Bars Due to Carbon Buildup from Exciter Brushes
| author name = Huey R, Johnson P, Narbut P
| author affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION V)
| addressee name = 
| addressee affiliation = 
| docket = 05000361
| license number = 
| contact person = 
| document report number = PNO-V-85-057A, PNO-V-85-57A, NUDOCS 8509190408
| document type = PRELIMINARY NOTIFICATION OF EVENT OR OCCURRENCE (PNO,, TEXT-INSPECTION &amp; AUDIT &amp; I&amp;E CIRCULARS
| page count = 1
}}
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                                      .                                                      i PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-V-85-57A Date. 09 13/85 This preliminary notification.cocntitutes.EARLY notice of events of POSSIBLE safety or public interest significance. The information presented is as initially received without verification or avaluation and is basically all that is known by Region V staff on this date.
FACILITY: Southern California Edison Inc.                             Emergency Classification San Onofre Nuclear Generating Station                    XX Notification of Unusual Event Unit 2                                                      Alert DN 50-361                                                   Site Area Emergency General Emergency Not Applicable
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==SUBJECT:==
UNIT 2 SHUTDOWN ON SEPTEMBER 12, 1985, DUE TO A FIRE IN THE TURBINE GENERATOR ENCLOSURE, UPDATE AS OF SEPTEMBER 13, 1985 The licensee declared an unusual event at 10:30 am (PDT) 9/12/85 due to a turbine trip / reactor trip caused by a fire in the main turbine exciter enclosure in Unit 2.            The Headquarters duty officer was notified at 10:58 am (PDT).
The event was terminated at 10:55 am (PDT) 9/12/85 after the fire was extinguished.
The licensee's investigations as of 9/13/85 indicate that the fire was caused by electrical arcing between the generator exciter bus bars due to carbon build-up from the exciter brushes. The licensee's examination of the lube oil and generator hydrogen seal systems indicates that they were not involved in the fire. A cooling fan attached to the exciter shaft also failed and impacted the exciter enclosure and generator enclosure causing deformation of the enclosures. The licensee expects Unit 2 to be shut down in excess of.
one week. The licensee is considering utilizing exciter brush assemblies from Unit 3 to repair Unit 2 (Unit 3 is scheduled to shut down for a refueling outage next week).
This information is current as of 8:00 am, September 13, 1985.
CONTACT:   P. Johnson, S         Chief              R. Huey, Senior Resident FTS 463-3745      u                       (714) 492-2641 P. Narbut, Project Engineer FTS 463-3730 DISTRIBUTION H St. M.*T            MNBBO N Phillips ~         E/W/.T/Willste*       Air Rights Mail:
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